The invention relates to modified antibiotic peptides, in particular derivatives of apidaecin and oncocin, preferably having increased stability, reduced immunoreaction, and improved pharmacokinetics. In the invention, the peptide antibiotics are reversibly protected by means of a linker having the polymer polyethylene glycol (PEG). The peptide linker contains a recognition sequence for trypsin-like serum proteases. In the apidaecin derivatives, the linker and the PEG are bonded to a side chain. In the serum, the linker is cut by serum proteases and PEG is separated off. The released peptide still contains remnants of the linker, which are still bonded to the amino group in the side chain. Astonishingly, said remaining remnants of the linker impair the activity of the antimicrobial peptide only a little or not at all.
该发明涉及改性抗生素肽,特别是蜜蜂素和肿瘤素的衍
生物,优选具有增强稳定性、减少免疫反应和改善药代动力学的特性。在该发明中,肽抗生素通过具有聚合物聚
乙二醇(P
EG)的连接剂进行可逆保护。肽连接剂包含一种识别序列,用于类胰
蛋白酶样血清
蛋白酶。在蜜蜂素衍
生物中,连接剂和P
EG与侧链结合。在血清中,连接剂被血清
蛋白酶切割,P
EG被分离。释放的肽仍然含有连接剂的残留物,这些残留物仍然与侧链中的
氨基团结合。令人惊讶的是,连接剂的剩余残留物仅轻微或根本不影响抗微
生物肽的活性。